This extension helps you to close multiple tabs with the same website.
Just start closing tabs with the same website one by one and the remaining tabs will be selected for you. You can then right-click one of the selected tabs and choose "Close tabs" to close them all. Alternatively, you can press Ctrl+W (or Cmd+W on Mac).
This extension can be useful when you routinely end up with lots of tabs with the same domain name (e.g. Google search results) and wish to get rid of them from time to time.